41. Q. Why use second heater? Why not heat it to a high temperature in
oil tank with oil heater?

A. Too much gas generating and boiling the oil continually destroys the
higher qualities besides being hard to control the flow through
regulation valve.

42. Q. Do you consider a vent hole in oil tank advisable, and why?

A. Yes; to allow any accumulation of gas to escape and to admit the air
so that oil will flow freely.

43. Q. Do you inspect your oil pipes and report all leaks? What other
bad effect has a pipe leak aside from waste of oil?

A. Yes. It will cause oil to feed irregularly.

44. Q. Are you aware that keeping the flues clean is the greatest one
thing that you can do in regard to fuel economy, and how often should
they be cleaned?

A. Yes. At least every ten miles.

45. Q. Do you know that the engine should be working hard and at a speed
not less than twenty miles per hour when sanding flues to avoid the sand
falling to floor of the fire-box and accumulating in front of them?

A. Yes.